Influential Factors of Air Content in RCC
Influence on air content in roller compacted concrete (RCC) was analyzed by experiments. The influencing factors are hardness of water, adding order of air entraining admixture (AEA), kind and dosage of AEA, set retarding super plasticizer and content of rock powder. Test results show that when the hardness of water in construction sites was increased, bubbling potential of AEA would be affected, along with reduce of air content of RCC. In comparison with the soft water of the hardness of 132. 14mg/L, medium hardness water with the hardness of 156. 33mg/L was able to reduce 0. 95％ of air content of RCC. Air content was increased when AEA is added after high efficiency water reducing agents with retardation setting. Effect of air entraining of rosin AEA was generally good and that of synthetic detergents and saponin AEA were less effective. If dosage of AEA was increased within a certain limits, air content of RCC would raise. Dosage of high efficiency water reducing agents with retardation setting ranged rom 0.6％ to 1.0％, its VC value reduced from 10.1s to 4.6s. Air content firstly increased, before gradual reduce. When rock powder of crushed sands was increased, effect of air entraining of would be reduced. When content of rock flour increased by 1％ air content would reduce by 0.1％.
roller compacted concrete air content influential factors air-entraining admixture
Li Keliang Chen Zurong Lin Quan Wang Yi Wen Jinbao
R-D High Technology Co., Nanjing Hydraulic Research Institute, 34 Hujugan Road Nanjing, 210024, China
国际会议
第五届碾压混凝土坝国际研讨会(The Fifth International Symposium on Roller Compacted Concrete(RCC))
贵阳
英文
463-466
2007-11-02（万方平台首次上网日期，不代表论文的发表时间）